MST-100 connect to A PC via USB cable, run MST-100 software on the PC during MST-100 running, the PC will display the test status and can control MST-100 for various oerpations.MST-100 connect to car via diagnostic cable, support OBD-II diagnostic socket and DLC20P diagnostic socket. OBD-II adapter is compactible with all the OBD diagnostic mode.